Audience: Students; Grades: 4-5; Subject Areas: Science. (2006) One of the worst natural disasters in history happened in December of 2004. It was a tsunami. A massive wall of water crashed on to the shore in Indonesia. It smashed into villages and swept away almost everything in its path. But a tsunami is just another sign that Mother Nature is continuing her natural process of change. Fortunately for us, dangerous tsunamis are also extremely rare.